/*
Given an array of ints, return true if the sequence of numbers 1, 2, 3 appears in the array somewhere.
eg:
array123([1, 1, 2, 3, 1]) → true
array123([1, 1, 2, 4, 1]) → false
array123([1, 1, 2, 1, 2, 3]) → true
*/
public boolean array123(int[] nums) {
for(int i=0; i